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A skier-triggered slab avalanche occurred in Chugach State Park, Alaska, on November 17, running about 1,000 feet down a northwest-facing slope on Peak 3. The slide originated just below Bail Out Rock, a prominent ridgeline feature, and was triggered on a wind slab that had formed on faceted snow buried a day earlier.
“While skinning up the upper face of Peak 3 I witnessed a slab avalanche break off and run roughly 1,000 vertical feet down the gulley. The crown of the avalanche, from my vantage point, appeared to be potentially 2 or 3 feet at its highest and as wide as maybe 100 meters. It started just below “Bail Out Rock,” which is located high on the final ridgeline that runs east to west from the Peak 3 summit. I was climber’s right of the slide path by roughly 50 meters when it passed me and probably 200 vertical feet below the crown. There were two other skiers on the mountain at the time. They were above and climber’s left of me. The avalanche appeared to propagate from the first skier when he crossed the open face from climber’s left to right. He was entrained in the slide and rode it all the way down till it stopped maybe 100 vertical feet above tree line near “Tax Day Rock.” He remained on top of the slide, was not buried and physically unhurt. His partner was not caught by the slide.”
– Report on CNFAIC
Witnessed by another backcountry skier, the avalanche crown was estimated at up to three feet and spanned approximately 330 feet (100 meters). The slide propagated from a crossing skier, who was carried down the slope for nearly the entire fall. The skier, who remained on top of the debris and was unharmed, was positioned about 165 feet (50 meters) to the right of the slide path at the time. A second skier was present higher on the mountain and was not caught.
Related: SnowBrains Podcast Ep. 91 | Brian Lazar – Deputy Director of the Colorado Avalanche Information Center
The avalanche was classified as D2, indicating a destructive size capable of causing significant damage. It occurred on a northwest aspect at roughly 3,700 feet in elevation. The recent snowpack, with layers of faceted crystals buried since November 16, contributed to the event.
The most recent avalanche forecast available at the time was from Friday, November 14, and stated, “It will become easier to trigger an avalanche 1 to 2′ deep as increasing winds build touchy slabs on top of current weak surfaces starting Friday afternoon. Chances for avalanches will increase even more with the next round of snow, which will likely arrive early next week. This will also be adding stress to a questionable layer of weak snow buried 2 to 3′ deep. Expect to see increasing danger with the next round of wind and snow, and consider dialing back terrain objectives once the weather picks up.”
Related: [PHOTOS] Skier Carried Over Steep, Rocky Cliff After 2 Separate Skier-Triggered Avalanches in British Columbia
Daily avalanche forecasts with danger ratings will begin next week, on Wednesday, November 26.
Photos
The post [PHOTOS] Skier Escapes Unharmed After Being Carried 1,000 Feet by Large Avalanche in Chugach State Park, AK appeared first on SnowBrains.
Ссылка на источник: https://snowbrains.com/skiers-escape-unharmed-after-being-carried-1000-feet-by-large-avalanche-in-chugach-state-park-ak/
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